Add PDF support in attachment preview dialog

src/core/Tools.cpp

@@ -486,7 +486,9 @@ namespace Tools
             "application/x-yaml",
             "application/protobuf",
         };
+
         static QStringList imageFormats = {"image/"};
+        static QStringList pdfFormats = {"application/pdf"};
 
         static auto isCompatible = [](const QString& format, const QStringList& list) {
             return std::any_of(
@@ -501,6 +503,10 @@ namespace Tools
             return MimeType::PlainText;
         }
 
+        if (isCompatible(mimeName, pdfFormats)) {
+            return MimeType::Pdf;
+        }
+
         return MimeType::Unknown;
     }
 } // namespace Tools

src/core/Tools.h

@@ -119,6 +119,7 @@ namespace Tools
     {
         Image,
         PlainText,
+        Pdf,
         Unknown
     };
 

src/gui/entry/PreviewEntryAttachmentsDialog.cpp

@@ -76,9 +76,17 @@ void PreviewEntryAttachmentsDialog::update()
         updateImageAttachment(m_data);
     } else if (m_type == Tools::MimeType::PlainText) {
         updateTextAttachment(m_data);
+    } else if (m_type == Tools::MimeType::Pdf) {
+        updatePdfAttachment(m_data);
     }
 }
 
+void PreviewEntryAttachmentsDialog::updatePdfAttachment(const QByteArray& data)
+{
+    // To preview a PDF as an image, you need to install the qt5-image-formats-plugin-pdf
+    updateImageAttachment(data);
+}
+
 void PreviewEntryAttachmentsDialog::updateTextAttachment(const QByteArray& data)
 {
     m_ui->attachmentTextEdit->setPlainText(QString::fromUtf8(data));
@@ -117,7 +125,5 @@ void PreviewEntryAttachmentsDialog::resizeEvent(QResizeEvent* event)
 {
     QDialog::resizeEvent(event);
 
-    if (m_type == Tools::MimeType::Image) {
+    update();
-        update();
-    }
 }

src/gui/entry/PreviewEntryAttachmentsDialog.h

@@ -50,6 +50,7 @@ private:
     void update();
     void updateTextAttachment(const QByteArray& data);
     void updateImageAttachment(const QByteArray& data);
+    void updatePdfAttachment(const QByteArray& data);
 
     QScopedPointer<Ui::EntryAttachmentsDialog> m_ui;